Alert archive / South Dakota / Flash Flood Warnings in 1999

Flash Flood Warning 4, NWS Aberdeen, SD

July 8, 1999McPherson County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Jul 8, 1999, 1:28 AM CDT for McPherson County, South Dakota. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 8, 1999, 1:28 AM CDT (06:28 UTC)
Expired: Jul 8, 1999, 5:30 AM CDT
In force: 4 hr
Issued by: NWS Aberdeen, SD
Area: Whole counties

County McPherson County, SD

The radar

The Aberdeen radar (KABR), 72 km from the middle of the area, began a volume at 06:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 6.5 hours before the alert went out and 116 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 22 J/kg
Mixed-layer CIN: -361 J/kg
Mixed-layer LCL: 2040 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before this flash flood warning went out at Jul 7, 9:01 PM CDT, 4 hours 27 minutes earlier.

Area forecast discussion, Jul 7, 9:01 PM CDT, 4 hours 27 minutes before

AREA FORECAST DISCUSSION FOR CENTRAL/NORTHCENTRAL AND NORTHEAST
SOUTH DAKOTA AND WEST CENTRAL MINNESOTA
NATIONAL WEATHER SERVICE ABERDEEN SD
900 PM CDT WED JULY 7 1999

CURRENTLY WATCHING CONVECTION IN WESTERN SOUTH DAKOTA.  CURRENT CAPE
VALUES OF OVER 4K J/KG WITH -8 LIS IN PIR AREA PER LAPS MODEL.  00Z
ABR SOUNDING SHOWS WARM MID LEVEL WITH H7 TEMP OF +11 C.  CURRENT
GOES SOUNDINGS ALSO SHOW WARM MID LEVELS WITH SIMILAR H7 TEMPS.  ETA
SHOWS STRONG WAA ESPECIALLY AT MID LEVEL WHICH SHOULD INHBIT
CONVECTION TRYING TO MOVE INTO OUR CWA.  CURRENT PACKAGE DESCRIBES
SITUATION WELL AND NO CHANGES ARE ANTICIPATED.

.ABR...NONE.
KEEFE

The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 10:08 PM CDT	Severe Thunderstorm Warning	ABR	Corson	32 min
Jul 7, 10:19 PM CDT	Severe Thunderstorm Warning	ABR	Campbell	36 min
Jul 7, 11:19 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	31 min
Jul 7, 11:50 PM CDT	Tornado Warning	ABR	McPherson	35 min
Jul 8, 12:20 AM CDT	Tornado Warning	ABR	Edmunds	30 min
Jul 8, 12:22 AM CDT	Tornado Warning	ABR	Brown	48 min
Jul 8, 12:24 AM CDT	Tornado Warning	ABR	McPherson	36 min
Jul 8, 1:46 AM CDT	Severe Thunderstorm Warning	ABR	Brown	64 min
Jul 8, 2:43 AM CDT	Severe Thunderstorm Warning	ABR	Day	62 min

Nearby

Flash Flood Warnings in South Dakota, 1999 Every flash flood warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.